摘要
短波电台可广泛用于军事和民用通信中,具有很高的研究与开发价值。短波通信是目前远距离通信的重要手段。因此介绍了一种通用的短波接收机射频前端的设计方案,主要对其中的关键技术和实现方式进行了论述,重点分析了设计中的非线性失真问题,给出了在工程中实用的设计方法,同时对电路的调试也给出了建议。而且还提供了一种工程实际中噪声系数的近似测试方法,最后列举了此种射频前端的实际应用。
HF radio station possesses extensive military applications as well as civil, being of great value in research and development. HF communication has been a main communicating mode in long distance communicating field. This paper describes a novel scheme for a RF frontend part of the common HF receiver. The key technology and realization method are discussed. Nonlinear distortion problem is analyzed in detail; the design method for practical project and suggestion on circuit test are provided. An approximate method for practical project to test noise figure is given also. Finally, the applications are illustrated with examples.
出处
《无线电通信技术》
2009年第3期46-48,共3页
Radio Communications Technology
关键词
短波通信
接收机
超外差
非线性失真
HF communication
receiver
superheterodyne
nonlinear distortion
